The virus that is propagating itself by masquerading as a Microsoft Security
Update uses usenet addresses to propogate itself.

I am not an expert on this virus, but I do have personal experience that may
prove useful. I have two accounts, one that I use solely for usenet
postings. I receive many of these security updates on this account. I have
another that I use for personal business and I have received none.

Using a seperate address (or a fake one) is a good way to keep the spam away
and should be done regardless. I like using a seperate one as opposed to a
fake one as it does allow one to one communication with other usenet
posters.

If your current address is already compromised I'd recommend contacting your
ISP and seeing if you can set up a second, private, address to start using
for your personal business only.

-D.L.